<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title>demo 2-20</title>
	</head>
	<body>
	</body>
	<script>
		let{toString:s} = 123;
		console.log(s === Number.prototype.toString);
		let {toString:b} = true;
		console.log(b === Boolean.prototype.toString);
	</script>
</html>